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Computational dynamics of the Nicholson-Bailey models

机译:Nicholson-Bailey模型的计算动态

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In population dynamics, the Nicholson-Bailey model describes the host-parasitoid system which has been well studied since 1930 with a consideration that the parameters are all positive real numbers. In this article, the dynamics of the Nicholson-Bailey model x(n+1) = x(n) (e(r(1-xn/x)-alpha yn)) and y(n+1) = x(n)(1-e(-alpha yn)) is reinvestigated computationally where all the parameters are considered as real numbers. The model has all sorts of dynamical behavior such as chaotic, periodic and locally stable/unstable equilibriums. In addition, the dynamics of the scaled Nicholson-Bailey x(n+1) = (x(n) + alpha)(e(r)(1 - ((xn+alpha)/kappa)-alpha(yn + beta))) , y(n+1) = (x(n)+alpha)(1-e(-alpha(yn+beta))) where alpha and beta are scaling factors and of the noisy model x(n+1) = x(n) (e(r(1-xn/kappa)-alpha yn)) + v(1) , y(n+1) = x(n) (1-e(-alpha yn)) + v(2) , where (v(1), v(2)) is uniformly distributed noise over the interval (0,1), are also reconnoitered computationally.
机译:在人口动态中,Nicholson-Bailey模型描述了自1930年以来已经很好地研究的宿主寄生虫系统,同时考虑到参数是所有正面的实数。 在本文中,Nicholson-Bailey模型x(n + 1)= x(n)的动态(e(r(r(1-xn / x)-alpha yn))和y(n + 1)= x(n )(在计算地计算所有参数被视为实数的情况下重新调用1-e(-alpha yn))。 该模型具有各种动态行为,如混沌,周期性和局部稳定/不稳定的均衡。 此外,缩放的Nicholson-Bailey x(n + 1)=(x(n)+α)(e(r)(1 - ((xn + alpha)/ kappa)-alpha(yn + beta)的动态 )),y(n + 1)=(x(n)+ alpha)(1-e( - α(yn + beta))),其中alpha和beta是缩放因子和噪声模型x(n + 1) = x(n)(e(r(1-xn / kappa)-alpha yn))+ v(1),y(n + 1)= x(n)(1-e(--alpha yn))+ v (2),其中(V(1),V(2))在间隔(0,1)上均匀分布噪声,也在计算地重新核对。

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